The stylish Duchess brought together the minimalist ensemble with a simple thin black leather belt around her waist and left her long black hair cascading in curls around her face.

The Duchess of Sussex, 38, joined husband Prince Harry, 35, for the sombre occasion (PA/AAP)The Duke of Sussex, who attended for the seventh time, dressed in his Household Division ceremonial robes and added a poppy to the side of his hat (PA/AAP)

The Royal couple paused for a two-minute silence before planting crosses in the field of poppies, dedicated to remembering those who lost their lives in service to their country in the First World War and other conflicts.

The Duchess of Cornwall was also meant to attend the opening of the 91st Field of Remembrance but had to cancel on doctor's orders.

The 91st Field of Remembrance is dedicated to remembering those who lost their lives in service to their country in the First World War and other conflicts (PA/AAP)

It's the second official engagement this week that Camilla was forced to skip after a chest infection has become "progressively worse".